SOLUTION: Using the perimeter formula for a rectangle and the fact that the perimeter should be 48 feet, solve for the length to write an equation for the length of the rectangle in terms of

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Question 129461This question is from textbook Fundamentals of Algebric Modeling
: Using the perimeter formula for a rectangle and the fact that the perimeter should be 48 feet, solve for the length to write an equation for the length of the rectangle in terms of the width.
My answer is:
P = 2L + 2W
48 = 2L + 2W
48 = 2(12) + 2(12)
48 = 24 + 24
P = 48
This question is from textbook Fundamentals of Algebric Modeling

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
No, you were on the right track and then you solved the equation.
Where did the magic number 12 come from??
You needed to find the length as a function of width.
P+=+2L+%2B+2W
48+=+2L+%2B+2W
Here is an equation with length and width in it.
Re-arrange this equation and you'll have your answer.
2L+%2B+2W=48
2L=48-2W
L=%2848-2W%29%2F2
L=24-W
This equation is the length as a function of width for a rectangle of perimeter 48.